Influence of hydrogen isotopes on displacement damage formation in EUROFER

Schmid, K.; Schwarz‐Selinger, T.; Arredondo, R.

doi:10.1016/j.nme.2022.101341

Cited by 4 publications

(10 citation statements)

References 18 publications

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“…As illustrated in figure 6, the entry of H atoms into the metal causes hydrogen-induced damage that reduces the toughness and flexibility of the metal, resulting in early failure of the material. The presence of hydrogen in metal materials causes not only evident plastic loss [6] but also hydrogen-induced damage [68][69][70] and hydrogen-induced delayed fracture [71]. The hydrogen-containing metal can be repaired by using the external electric field of section 3.1 to accelerate dehydrogenation.…”

Section: The Mechanical Properties Of Fe 3 Cr Alloy Regulated By the ...mentioning

confidence: 99%

Applied electric field to repair metal defects and accelerate dehydrogenation

Gao,

Zeng,

Chi

2024

Modelling Simul. Mater. Sci. Eng.

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Repairing metal micro-defects at the atomic level is very challenging due to their random dispersion and difficulty in identification. At the same time, the interaction of hydrogen with metal may cause hydrogen damage or embrittlement, endangering structural safety. As a result, it is critical to speed up the dehydrogenation of hydrogen-containing materials. The applied electric field can repair the vacancy defects of the material and accelerate the dehydrogenation of the hydrogen-containing metal. The influence of the external environment on the diffusion coefficient of hydrogen in polycrystalline metals was researched using molecular dynamics in this article, and the mechanism of hydrogen diffusion was investigated. Simultaneously, the mechanical characteristics of Fe3Cr alloy were compared during typical heat treatment and electrical treatment. The effect of temperature, electric field strength, and electric field direction on the diffusion coefficient was investigated using orthogonal test analysis. The results demonstrate that temperature and electric field strength have a significant impact on the diffusion coefficient. The atom vibrates violently as the temperature rises, breaking past the diffusion barrier and completing the atomic transition. The addition of the electric field adds extra free energy, decreases the atom's activation energy, and ultimately enhances the atom's diffusion coefficient. The repair impact of vacancy defects under electrical treatment is superior to that of typical annealing treatment for polycrystalline Fe3Cr alloy. The electric field can cause the dislocation to migrate, increasing the metal's toughness and plasticity. This research serves as a useful reference for the electrical treatment of metal materials and offers a method for the quick dehydrogenation of hydrogen-containing materials.

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Section: The Mechanical Properties Of Fe 3 Cr Alloy Regulated By the ...mentioning

confidence: 99%

Applied electric field to repair metal defects and accelerate dehydrogenation

Gao,

Zeng,

Chi

2024

Modelling Simul. Mater. Sci. Eng.

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“…The trapping parameters for EUROFER where recently determined by fitting TDS spectra with TESSIM-X in [24]. The data fitted in [24] was taken from [15] where EUROFER samples were damaged at 300 K with 20 MeV W-ions and then loaded with D at 370 K to decorate the defects created by the displacement damage. The best fit was achieved with two defect types, one due to the displacement damage, located only at the surface within the depth range affected by the Wion irradiation and the other intrinsic trapping site distributed homogeneously throughout the sample.…”

Section: Trapping Parameters In Eurofermentioning

confidence: 99%

“…In contrast to the W data, the damaging was done at ambient temperatures and to assess the effect of temperature the samples were annealed after damaging at 600 K and 800 K (see [15]). This resulted in essentially full annealing the trap sites induced by the displacement damage whereas the intrinsic defects were not affected.…”

Section: Trapping Parameters In Eurofermentioning

confidence: 99%

“…However, for displacement-damaged EUROFER the database is rather sparse. First results [15,16] suggest that EUROFER behaves similar to W under displacement damage in so far as the trap site concentration increases and that the presence of His and He further increase the maximum trapped concentration of His by a factor two each. However, for low temperature operation the concentration of trapped HIs in EUROFER is a factor 100 lower than in W [16].…”

Section: Introductionmentioning

confidence: 96%

“…However, for low temperature operation the concentration of trapped HIs in EUROFER is a factor 100 lower than in W [16]. Also results from [15,16] suggest that displacement generated traps in EUROFER anneal at 600 K and only the weak intrinsic traps remain. However first unpublished results suggest that the presence of He, which would result from transmutation in a fusion reactor, stabilizes the displacement damage induced trap sites.…”

Section: Introductionmentioning

confidence: 96%

See 2 more Smart Citations

Implications of T loss in first wall armor and structural materials on T-self-sufficiency in future burning fusion devices

Schmid,

Schwarz-Selinger,

Arredondo

et al. 2024

Nucl. Fusion

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Future fusion reactors will have to breed enough tritium (T) to sustain continuous operation and to produce excess T to power up other fusion reactors. Therefore, T is a scarce resource that must not be lost inside the fusion power plants systems. The factor that describes the T production is the “tritium breeding ratio” (TBR) which is the ratio of the breading rate in atoms per second to the burn rate in atoms per second. Its value is calculated from neutronics analyses of the breeding process in the blanket and coupled dynamics of the T processing plant. However, these calculations generally ignore the T transport and loss in the first wall by assuming essentially instantaneous recycling of the impinging T in-flux. In this paper the transport and retention of T in the main chamber first wall of a future EU-DEMO reactor is investigated based on the available material data and expected particle loads onto the wall. Two breeding blanket concepts are compared WCLL (Water Cooled Lithium Lead) and HCPB (Helium Cooled Pebble Bed) and the resulting wall-loss probabilities are compared with a simple balance model that describes the maximum allowable wall loss given a TBR to achieve T-self-sufficiency.

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